CN106561894B - Preparation method of high-tea-polyphenol instant green tea powder and instant green tea powder - Google Patents
Preparation method of high-tea-polyphenol instant green tea powder and instant green tea powder Download PDFInfo
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- CN106561894B CN106561894B CN201610990227.4A CN201610990227A CN106561894B CN 106561894 B CN106561894 B CN 106561894B CN 201610990227 A CN201610990227 A CN 201610990227A CN 106561894 B CN106561894 B CN 106561894B
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/16—Tea extraction; Tea extracts; Treating tea extract; Making instant tea
- A23F3/18—Extraction of water soluble tea constituents
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/16—Tea extraction; Tea extracts; Treating tea extract; Making instant tea
- A23F3/22—Drying or concentrating tea extract
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/16—Tea extraction; Tea extracts; Treating tea extract; Making instant tea
- A23F3/22—Drying or concentrating tea extract
- A23F3/26—Drying or concentrating tea extract by lyophilisation
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/16—Tea extraction; Tea extracts; Treating tea extract; Making instant tea
- A23F3/22—Drying or concentrating tea extract
- A23F3/28—Drying or concentrating tea extract by spraying into a gas stream
Abstract
The application discloses a preparation method of high-tea-polyphenol instant green tea powder and the instant green tea powder. The preparation method comprises the steps of firstly washing green tea at low temperature by taking water as a solvent, then extracting at high temperature, concentrating and drying the high-temperature extraction filtrate to obtain instant green tea powder with the tea polyphenol content of more than 86%; the low-temperature tea washing temperature is 30-60 ℃, and the water consumption is 8-15 times of the weight of the tea; the high-temperature extraction temperature is above 85 deg.C, and the amount of water is 10-25 times of the weight of tea. The preparation method of the application completely adopts water extraction, has no other solvent or exogenous substances, and is environment-friendly and safe. The method provides the low-temperature tea washing and high-temperature extraction processes by utilizing the characteristic that the dissolution rates of the effective components in the tea are different at different temperatures, and effectively improves the content of tea polyphenol in the instant green tea powder. The preparation method has the advantages of simple process, easy operation and low production cost, and is particularly suitable for industrial mass production.
Description
Technical Field
The application relates to the field of instant green tea powder, in particular to a preparation method of high-tea-polyphenol instant green tea powder and the instant green tea powder prepared by the same.
Background
Instant tea powders are typically made from tea leaves by extraction, filtration or centrifugation, concentration and drying. The instant tea powder can be completely dissolved in water, has no tea residue, maintains the special flavor of tea, is ready to drink after being mixed with water, and can also be used as a raw material of food beverage. The content of tea polyphenol in the instant tea powder obtained by adopting the conventional processing method is relatively low and can not exceed 65 percent normally. Because tea polyphenol is an important active ingredient in tea, the domestic and foreign markets have certain requirements on high-tea-polyphenol instant tea which is not processed by using a solvent in the production, and the demand is increased more and more.
In the prior art, in order to increase the content of tea polyphenol in instant tea powder, the following methods are generally adopted: firstly, the content of tea polyphenol in the instant tea powder is improved by using a specific membrane, secondly, an organic solvent such as ethanol is utilized, the solubility of the tea polyphenol in the organic solvent is utilized to carry out separation and purification to prepare the high-tea-polyphenol instant tea powder product, thirdly, the high-tea-polyphenol instant tea product is prepared by utilizing a resin separation technology, fourthly, the high-tea-polyphenol instant tea product is prepared by adding an exogenous reagent such as metal ions, and fifthly, the content of the tea polyphenol is improved by removing caffeine by utilizing a supercritical method. Sixthly, the high tea polyphenol instant tea product is prepared by comprehensively using two or more than two technical means in the technologies of membrane separation, organic solvent, resin adsorption separation and purification, exogenous reagent, supercritical and the like. For example, patent application 201010542626.7 employs membrane separation techniques, patent applications 200610155276.2 and 200910055663.2 employ resin adsorption, and patent applications 98111572.1 and 201310683801.8 employ supercritical extraction.
In the existing method for improving the content of tea polyphenol in instant tea powder, the content of the obtained tea polyphenol is not high enough, for example, although patent application 201010542626.7 obtains the content of the tea polyphenol higher than 65%, the content of the tea polyphenol is only about 75%; or high cost, such as the supercritical extraction employed in patent applications 98111572.1 and 201310683801.8; or the applied equipment and process are too complex, for example, an ultrasonic multistage countercurrent extraction column is needed in patent application 201410399252.6, the equipment investment is large in industrial production, and the highest polyphenol content of the obtained product is 75.6 percent; or a large amount of organic solvent or exogenous reagent is adopted, which is not beneficial to environmental-friendly production. Therefore, there is a need to develop a simpler and more effective process for increasing the content of tea polyphenols.
Disclosure of Invention
The application aims to provide a novel preparation method of high-tea-polyphenol instant green tea powder and the instant green tea powder prepared by the method.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the application discloses a preparation method of high-tea-polyphenol instant green tea powder, which comprises the steps of firstly washing green tea at low temperature by using water as a solvent, then extracting at high temperature, concentrating and drying filtrate obtained by high-temperature extraction to obtain instant green tea powder with the tea polyphenol content of more than 86%; the temperature of low-temperature tea washing is 30-60 ℃, and the water consumption for tea washing is 8-15 times of the weight of the tea; the temperature of high-temperature extraction is above 85 deg.C, and the amount of water is 10-25 times of the weight of tea.
The key point of the application lies in that the characteristic that the dissolution rates of effective components in tea leaves are different at different temperatures is utilized, specific low-temperature tea washing and high-temperature extraction are respectively adopted to treat the green tea, the low-temperature tea washing enables the effective components easy to dissolve out of the tea leaves to be extracted firstly, and the high-temperature extraction enables tea polyphenols with relatively slow dissolution rate, particularly macromolecular tea polyphenols such as EGCG and the like to be extracted effectively, through the treatment, the content of the tea polyphenols in high-temperature extraction filtrate can be effectively improved, and then the instant green tea powder with high tea polyphenol content is prepared.
Preferably, the tea is washed at low temperature for 1-3 times, and each time of soaking is 10-60 minutes.
Preferably, the high-temperature extraction is performed for 1-3 times, and each time of soaking is 10-60 minutes.
It should be noted that the key point of the present application is to use low-temperature tea washing and high-temperature extraction in combination, and the specific times and time of low-temperature tea washing and high-temperature extraction can be adjusted according to different production conditions or the tea leaves. It can be understood that the more times, the longer the soaking time, the more tea polyphenols may be obtained; however, in consideration of extraction efficiency and cost, the times of low-temperature tea washing and high-temperature extraction are preferably 1-3 times respectively, and each time of soaking is 10-60 minutes. It should be added that, in an implementation manner of the present application, the times of low-temperature tea washing and high-temperature extraction are 3 times, and the total water consumption for low-temperature tea washing is 8-15 times of the weight of the tea leaves for 3 times, and the total water consumption for high-temperature extraction is 10-25 times of the weight of the tea leaves for 3 times.
Preferably, in the preparation method, the concentration comprises the steps of sequentially carrying out reverse osmosis membrane concentration and vacuum reduced pressure concentration to obtain a concentrated solution with the liquid concentration of 20-60 Brix.
It is noted that a large number of experiments and researches show that the concentration of the filtrate gradually reaches 20-60 Brix required by the application by jointly applying reverse osmosis membrane concentration and vacuum reduced pressure concentration, so that the loss of tea polyphenol caused by concentration is avoided to the maximum extent, and the content of the tea polyphenol in the finally prepared instant green tea powder is favorably ensured.
Preferably, in the preparation method of the present application, the drying is spray drying or freeze drying.
Preferably, the filtrate extracted at high temperature is obtained by filtering the tea leaves extracted and soaked at high temperature through a vibrating screen or a filter screen.
Preferably, before concentrating the filtrate extracted at high temperature, the method further comprises a clarification treatment of the filtrate, wherein the clarification treatment comprises filtering the filtrate by using a hollow fiber membrane, or centrifuging the filtrate by using a centrifuge to further remove solid particles insoluble in water.
Preferably, the green tea is a large leaf species green tea and/or a small leaf species green tea.
In order to ensure the content of tea polyphenols in the instant green tea powder, the instant green tea powder is preferably prepared from the large leaf green tea or the small leaf green tea, or the two may be mixed, and is not particularly limited herein.
Preferably, the preparation method further comprises collecting the filtrate of low-temperature tea washing, and concentrating and drying the filtrate of low-temperature tea washing by the same method to obtain the instant green tea powder.
The term "the same method" includes, among others, filtering by the same method to obtain a filtrate, concentrating and drying by the same method, clarifying by the same method, and the like; in short, the method for obtaining the instant green tea powder by washing the filtrate of the tea at the low temperature is the same as the method for preparing the instant green tea powder with high tea polyphenol content by extracting the filtrate at the high temperature.
It should be added that, although the purpose of washing tea at low temperature is to facilitate the dissolution of more macromolecular tea polyphenols in the subsequent high-temperature extraction, the content of tea polyphenols in the instant green tea powder prepared by the high-temperature extraction filtrate is increased; however, as mentioned above, a part of the effective components are still dissolved out in the low-temperature tea washing, and in order to avoid the waste of the effective components, in one implementation mode of the application, the filtrate of the low-temperature tea washing is also made into instant green tea powder, and the instant green tea powder only has low content of tea polyphenol and can be used as a raw material of a conventional tea beverage.
The other side of the application discloses instant green tea powder prepared by the preparation method.
Due to the adoption of the technical scheme, the beneficial effects of the application are as follows:
the preparation method of the instant green tea powder completely adopts water extraction, does not add other solvents or exogenous substances, and is environment-friendly and safe. In addition, the method creatively provides the low-temperature tea washing and high-temperature extraction processes by utilizing the characteristic that the dissolution rates of the effective components in the tea at different temperatures are different, so that the content of the tea polyphenol in the instant green tea powder is effectively improved. The preparation method has the advantages of simple process, easy operation and low production cost, and is particularly suitable for industrial mass production.
Detailed Description
The key of this application lies in, adopts the low temperature of special research and development to wash tea and high temperature extraction process and draws green tea active ingredient to the content of tea polyphenol in the instant green tea powder of effectual improvement, in the implementation of this application, the content of tea polyphenol all is more than 86%.
The preparation method can well improve the content of the tea polyphenol in the extracting solution of the water extracted green tea, namely improve the extraction rate of the tea polyphenol; therefore, the preparation method can be used for preparing the instant green tea powder with high tea polyphenol content, and can also be used for preparing green tea concentrated juice or green tea beverage with high tea polyphenol content. For example, the subsequent concentration and drying steps are not required for preparing a green tea beverage having a high tea polyphenol content, and the drying step is not required for preparing a green tea concentrated juice having a high tea polyphenol content, and is not particularly limited herein.
The present application will be described in further detail with reference to specific examples. The following examples are intended to be illustrative of the present application only and should not be construed as limiting the present application.
Example one
The instant green tea powder is prepared from large-leaf green tea, and the specific method comprises the following steps:
weighing 200kg of large-leaf green tea with granularity of 20-60 meshes, adding 1000kg of water, soaking at 30 ℃ for 30 minutes, and filtering with a filter screen to obtain green tea washing liquid A; after tea water is separated, 800kg of water is added, and after the tea water is soaked for 10 minutes at the temperature of 30 ℃, the tea water is filtered by a filter screen to obtain green tea washing liquid B; repeating the above operations to obtain tea washing liquid C, and combining the tea washing liquids A, B, C to obtain tea washing liquid D. Adding 800kg water into folium Camelliae sinensis after washing, soaking at 95 deg.C for 30 min, filtering with filter screen to obtain green tea extractive solution E, repeating the above extraction operation twice to obtain extractive solutions F, G, and mixing extractive solutions E, F, G to obtain extractive solution H.
In this example, the tea washing liquid D and the extract H were centrifuged by a disk centrifuge to obtain clear and transparent tea washing liquid tea juice I and extract tea juice J, and the I, J tea juice was subjected to reverse osmosis membrane concentration and vacuum concentration under reduced pressure, and finally spray-dried to obtain the instant green tea powder of this example. Wherein the tea juice J extracted at high temperature is 8.6kg of high tea polyphenol instant green tea powder, and the tea juice I of the tea washing liquid obtained by washing tea at low temperature is 27.8kg of instant green tea powder with lower active ingredient content.
The two parts of instant green tea powder are detected by adopting a tea polyphenol detection method in QB/T4067-2010 instant tea for food industry (appendix A). The results showed that 8.6kg of high tea polyphenol instant green tea powder had a tea polyphenol content of 91.3% and 27.8kg of instant green tea powder having a lower active ingredient content had a tea polyphenol content of 32.5%.
Therefore, the preparation method of the embodiment can obtain the instant green tea powder with the tea polyphenol content of 91.3%, has high product value and specificity in application, and can meet the requirements which cannot be met by conventional tea powder. The instant green tea powder obtained by concentrating and drying the filtrate of washing tea at low temperature can be used as a raw material of a conventional tea beverage to avoid waste although the content of tea polyphenol is low.
Example two
The instant green tea powder is prepared from large-leaf green tea, and the specific method comprises the following steps:
weighing 200kg of large-leaf green tea with granularity of 20-60 meshes, adding 1200kg of water, soaking at 60 ℃ for 30 minutes, and filtering with a filter screen to obtain green tea washing liquid A; adding 1000kg of water after tea water separation, soaking for 10 minutes at 30 ℃, and filtering by using a filter screen to obtain green tea washing liquid B; and combining the tea washing liquid A, B to obtain tea washing liquid C. Adding 1000kg water into washed tea leaf, soaking at 95 deg.C for 30 min, filtering with filter screen to obtain green tea extractive solution D, repeating the above steps twice to obtain extractive solutions E, F, and mixing extractive solutions D, E, F to obtain extractive solution G.
And respectively centrifuging the tea washing liquid C and the extracting solution G by using a disk centrifuge to obtain clear and bright tea washing liquid tea juice H and extracting solution tea juice I, respectively concentrating the H, I tea juice by using a reverse osmosis membrane and carrying out vacuum reduced pressure concentration, and finally carrying out spray drying to obtain the instant green tea powder. Wherein the tea juice I extracted at high temperature is used to obtain 9.7kg of high tea polyphenol instant green tea powder, and the tea juice H of the tea washing liquid obtained by washing at low temperature is used to obtain 25.8kg of instant green tea powder with lower active ingredient content.
The two parts of instant green tea powder are detected by adopting a tea polyphenol detection method in QB/T4067-2010 instant tea for food industry (appendix A). The result shows that the tea polyphenol content of 9.7kg of the high-tea-polyphenol instant green tea powder is 88.2 percent, and the special application of the high-tea-polyphenol instant green tea powder can be met; 25.8kg of instant green tea powder with low active ingredient content has the tea polyphenol content of 33.1 percent and can be used as a conventional tea beverage raw material.
EXAMPLE III
In the embodiment, the instant green tea powder is prepared by adopting the leaflet seed green tea, and the specific method comprises the following steps:
weighing 200kg of lobular green tea with granularity of 20-60 meshes, adding 1200kg of water, soaking at 60 ℃ for 30 minutes, and filtering by using a filter screen to obtain green tea washing liquid A; adding 1000kg of water after tea water separation, soaking for 10 minutes at 30 ℃, and filtering by using a filter screen to obtain green tea washing liquid B; and combining the tea washing liquid A, B to obtain tea washing liquid C. Adding 1000kg water into washed tea leaf, soaking at 95 deg.C for 30 min, filtering with filter screen to obtain green tea extractive solution D, repeating the above steps twice to obtain extractive solutions E, F, and mixing extractive solutions D, E, F to obtain extractive solution G.
And respectively centrifuging the tea washing liquid C and the extracting solution G by using a disk centrifuge to obtain clear and bright tea washing liquid tea juice H and extracting solution tea juice I, respectively concentrating the H, I tea juice by using a reverse osmosis membrane and carrying out vacuum reduced pressure concentration, and finally carrying out spray drying to obtain the instant green tea powder. Wherein the tea juice I extracted at high temperature is used to obtain 7.9kg of high tea polyphenol instant green tea powder, and the tea juice H of the tea washing liquid obtained by washing at low temperature is used to obtain 21.7kg of instant green tea powder with lower active ingredient content.
The two parts of instant green tea powder are detected by adopting a tea polyphenol detection method in QB/T4067-2010 instant tea for food industry (appendix A). The result shows that the content of tea polyphenol in 7.9kg of high-tea-polyphenol instant green tea powder is 86.9 percent, which can meet the special application of the high-tea-polyphenol instant green tea powder; while 21.7kg of instant green tea powder with lower active ingredient content has the tea polyphenol content of 26.7 percent and can be used as a conventional tea beverage raw material.
Example four
The instant green tea powder is prepared by mixing large-leaf green tea and small-leaf green tea, and the specific method is as follows:
weighing 100kg of small-leaf green tea with granularity of 20-60 meshes and 100kg of large-leaf green tea with granularity of 20-60 meshes respectively, mixing uniformly, adding 1200kg of water, soaking for 30 minutes at 60 ℃, and filtering by using a filter screen to obtain green tea washing liquid A; adding 1000kg of water after tea water separation, soaking for 10 minutes at 30 ℃, and filtering by using a filter screen to obtain green tea washing liquid B; and combining the tea washing liquid A, B to obtain tea washing liquid C. Adding 1000kg water into washed tea leaf, soaking at 95 deg.C for 30 min, filtering with filter screen to obtain green tea extractive solution D, repeating the above steps twice to obtain extractive solutions E, F, and mixing extractive solutions D, E, F to obtain extractive solution G.
And respectively centrifuging the tea washing liquid C and the extracting solution G by using a disk centrifuge to obtain clear and bright tea washing liquid tea juice H and extracting solution tea juice I, respectively concentrating the H, I tea juice by using a reverse osmosis membrane and carrying out vacuum reduced pressure concentration, and finally carrying out spray drying to obtain the instant green tea powder. Wherein the tea juice I extracted at high temperature is used for obtaining 9.3kg of high tea polyphenol instant green tea powder, and the tea juice H of the tea washing liquid obtained by washing tea at low temperature is used for obtaining 24.7kg of instant green tea powder with lower active ingredient content.
The two parts of instant green tea powder are detected by adopting a tea polyphenol detection method in QB/T4067-2010 instant tea for food industry (appendix A). The result shows that the tea polyphenol content of 9.3kg of the high-tea-polyphenol instant green tea powder is 88.9 percent, which can meet the special application of the high-tea-polyphenol instant green tea powder; the content of tea polyphenol in 24.7kg of instant green tea powder with low active ingredient content is 30.7%, and the instant green tea powder can be used as a conventional tea beverage raw material.
The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (6)
1. A preparation method of high-tea-polyphenol instant green tea powder is characterized by comprising the following steps: the method comprises the steps of firstly washing green tea at low temperature by using water as a solvent, then extracting at high temperature, concentrating and drying filtrate obtained by high-temperature extraction to obtain instant green tea powder with the tea polyphenol content of more than 86%; the temperature of the low-temperature tea washing is 30-60 ℃, and the water consumption for washing the tea is 8-15 times of the weight of the tea; the temperature of the high-temperature extraction is more than 85 ℃, and the amount of water is 10-25 times of the weight of the tea; the tea is washed at low temperature for 2-3 times, and each time of soaking is 10-60 minutes; the high-temperature extraction is carried out for 3 times, and each time of soaking is 10-60 minutes.
2. The method of claim 1, wherein: the concentration comprises the steps of sequentially carrying out reverse osmosis membrane concentration and vacuum reduced pressure concentration to obtain a concentrated solution with the liquid concentration of 20-60 Brix.
3. The method of claim 2, wherein: the drying is spray drying or freeze drying.
4. The method of claim 1, wherein: the filtrate extracted at high temperature is obtained by filtering the tea leaves extracted and soaked at high temperature through a vibrating screen or a filter screen.
5. The method of claim 4, wherein: before the filtrate extracted at high temperature is concentrated, the filtrate is clarified, wherein the clarification comprises filtering the filtrate by adopting a hollow fiber membrane, or centrifuging the filtrate by adopting a centrifuge, and further removing solid particles insoluble in water.
6. The method of claim 1, wherein: the green tea is a large-leaf green tea and/or a small-leaf green tea.
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| CN110613033A (en) * | 2019-10-17 | 2019-12-27 | 深圳市海能达实业有限公司 | High-tea-polyphenol golden flower black tea powder extraction method and high-tea-polyphenol golden flower black tea powder |
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